Hood-insulating means for drying-machines



W I TNESS:

H. T. BAKER.

HOOD INSULATING MEANS'FOR DRYING MACHINES.

APPLICATION FILED APR. 16, 1921.

Patented Nov. 15, 1921 2 SHEE TSSHEET l.

I N VEN TOR,

ATTORNEY.

H. T BAKER.

HOOD INSULATING MEANS FOR DRYING MACHINES.

APPLICATION FILED APR. I6, I921.

Patented Nov. 15, 11921 2 SHEETS-SHEET 2- W/TNESS: I INVENTOR,

- ATTORNEY.

HAROLD T. BAKER, OF DAYTON, OHIO, ASSIGNUR TO THE MANAGEMENT, ENGINEER-ING AND DEVELOPMENT COMPANY, OF DAYTON, OHIO, CORPORATION OF OHIO.

HOOD-INSULATING- MEANS FOR DRYING-MACHINES.

Application filed. April 16,

T 0 a-ZZ-w from it may concern:

Be it known that I, HAROLD T. BAKER, a citizen of the United States,residing in the city of Dayton, in the county of Montgomery and State ofOhio, have invented certain new and useful Improvements inHood-Insulating Means for Drying-Machines, of which the following is aspecification.

The principal object of the invention is,

to provide insulating means for'the under surface of the hoods of dryingmachines, and more particularly, but not necessarily, paper and pulpdrying machines. While these insulating means preferably comprise acombination of gypsum and asbestos to tion, and particularly pointed outin the subjoined claims.

In the accompanying drawings, Figure 1 is a perspective view of a paperdrying machine, whose hood is partly broken away to reveal theinsulating means applied to the undersurface thereof. Fig. 2 is a sideelevationalview of a section of the hood frame, showing-how myinsulating means are supported thereby. Fig. 3 is a side elevationalview of. a section of the hood frame, showing how the latter may besupported from the roof of an inclosing building and also the uptakewhich conducts the vaporladen air from the interior of the hood to theoutside air. And Fig. 4 is a cross section of the hood frame, taken onthe line ar-a of Fig.

2, showing the corrugated asbestos and gypsum insulation therein.

Throughout the specification and drawings, similar reference charactersdenote corresponding parts.

Referring to the accompanying drawings for a detailed description of thepreferred form-of embodiment of my invention, the numeral 1 designatesthe inclosing frame of a series of paper dryers 2 disposed in a mannerwell known in the art. Mounted upon Specification of Letters PatentPatented Nov. 15, 1921..

3.921. Serial No. 461,981.

each side of the frame 1, is a .series of upright supporting members 3,connected by "truss rods 3 for a hood now to be described.

Bolted to the tops of the upright members 3 are longitudinal I beammembers 1 and end channel members 4 those on one side inclining upwardlyfor connection to those on the opposite side by means of a connectionblock 4", to form with the truss rods 3 a triangular truss frame for thehood. Disposed between thel beam members 4- in rows that are asubstantial distance apart, are transverse channel members 5 which areconnected to the I beam members at by clip angles 6. (See Figs. 2 and4.)

In Fig. 3 I have shown a hood frame which is supported from the roof ofthe building (not shown) by rods 7 that are connected at their lowerends to the I beam' members 4. The insulating means, now to bedescribed, are adapted to be installed in hood frames supported eitherfrom the roof of the building or by the 'upright members 3.

Resting upon the channel members 5 are the hook ends 8 of downwardlydepending.

straps 9 having right-angled lower ends 10. Secured to the latter bybolts 11 and nuts 12 are sheets of corrugated asbestos 13 upon which ispoured gypsum 14:. The latter, with the corrugated asbestos, forms aninsulating medium which prevents the temperature of the saturated air onthe inside of the hood, from being reduced by the cooler air 011 theoutside, to a point which would condense the saturated air, therebycausing drops of water to fall upon the pulp or paper beneath, withinjurious results.

As is well known in the art, the hood of a pulp or paper drying machineprevents the saturated air above the dryers from leaving the vicinity ofthem, for if any of it gets in the room, some of it will be condensedand drop on the wet end of the machine, where it will go directlythrough the paper and cause it to break in the presses. T he hood,therefore, is designed to direct this saturated air to the uptakes 15,15 by which it is conducted through the roof (not shown) to the outsideatmosphere.

Since thesaturated air within the hood must be maintained at atemperature at or above the condensation point, inorder to prevent dropsof moisture falling upon the I pulp or paper on the dryers beneath, Ihave provided the combination gypsum andasbestos insulating means beforedescribed. These means, because of their low heat conductivity, willprevent the saturated air from being condensed on the inner surface ofthe ceiling of the hood, which is in contact with the cooler air on theoutside. While I employ gypsum in combination with the asbestos foreffecting the above result, any other form of heat insulating materialsuch as mineral wool may be used without departing from the spirit ofthe invention.

To cotiperate 'withthe heat insulating means secured to the top frame ofthe hood, to prevent the escape of moisture from within the hood, andalso to make the latter fireproof, a corrugated asbestos sheet 16 issuspended from each end of the hood frame, while a corrugated asbestossheet 17 depends fr)om the top of each side thereof. (See Fig. 1.

To lead away any moisture that may be formed within the uptakes 15, 15,which, being constructed of sheet metal, are sulficiently conductive ofheat to cause the con-. densation of the saturated air passing throughthem, the following means are provided. Attached to the bottom of eachuptake 15 is a gutter 18 which is connected at its lowest point to adrain pipe 19 that leads the condensation to a suitable collectionpoint. (See Fig. 3.)

It will be seen that my hood frame may be easily assembled by boltingthe frame members together to receive the asbestos sheets, which aresuspended from straps that are hooked over the channel members 5. Afterthe asbestos strips are secured to the frame, the gypsum may be pouredupon tached to said uptak them as a form to provide the insulating meansabove described.

I do not wish to be limited to the details of construction andarrangement herein shown and described, and any changes or modificationsmay be made therein within depending from said supporting members,

asbestos sheets secured to said straps, and gypsum supported by saidasbestos sheets.

2. Ina drying machine, the combination with a hood therefor, oflongitudinal truss frame members, transverse member's supported betweenthe latter, straps depending from said transverse members, corrugatedasbestos sheets bolted to the lower ends of said straps, and gypsumsupported by said asbestos sheets.

{5. In a drying machine, the combination with a hood therefor, ofuptakes projecting through said hood for conducting vaporladen airtherefrom, and drainage means ates for leading away any condensationtherein.

4. In a drying machine, the combination with a hood therefor, of uptakesprojecting through said hood for conducting vaporladen air therefrom,gutters secured to the bottom portions of said uptakes, and a drain-HAROLD T. BAKER.

Witness:

HOWARD S. SMrrH.

